Separation of substances Worksheet-2

Separation of substances Worksheet-2

 

Multiple-Choice Question:

  1. A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture?

(A) Sieving           (B) Winnowing    (C) Handpicking  (D) Filtration

 

  1. Bronze is an alloy of:

(A) Copper and zinc                         (B) Copper and tin

(C) Copper and iron                         (D) Copper and nickel

 

  1. If the constituents of a solid-liquid mixture have different masses, then we can separate them using:

(A) sublimation                                (B) centrifugation

(C) winnowing                                 (D) evaporation

 

  1. The method of separating mixtures using damp paper is called:

(A) Chromatography                       (B) Photography

(C) Metallurgy                                  (D) Spectrography

 

  1. Separating the components of a homogeneous mixture using electricity is called:

(A) Electrification                            (B) Electrolysis

(C) Electrolyte                                  (D) Electromagnetisation

 

  1. Solubility of a substance ______with _______ in temperature.

(A) Increase, decrease                     (B) Increase, increase

(C) Decrease, increase                     (D) Decrease, decrease

 

  1. Match the following:

 

True/False:

  1. Wood in pencil is considered a chemical mixture.
  2. The process of washing of rice is decantation.
  3. The quantity of a substance that can be dissolved in hot water is much more than in cold water.
  4. Husk and wheat can be easily sepa­rated by winnowing.
  5. The process of winnowing is used to remove small stone particles from wheat.

 

Answer key:

  1.  (C)
  2. (B)
  3. (D)
  4. (A)
  5. (B)
  6. (B)
  7. 1-c, 2-e, 3-d, 4-a, 5-b, 6-f
  8. True
  9. True
  10. True
  11. True
  12. False